Correct option is E) sour

Correct option (2) Mg-Al

Explanation:

It is completely memory based question for air-craft construction aluminum and its alloy is used because these are lighter.

The correct option (1) Mg - Al   

Explanation:

Mg - Al alloy is used in manufacturing of Aeroplane.

Correct option is A) everywhere

Correct option is D) everywhere

Linear Inequalities:

Previously we read about equations which denote equality. We take an example of the number of student two classes. If the number of student in one class is same as that in another class then this involves equality. But in reality, we see that the number of students in each class varies in number. Thus, if the number of students is different in different classes we represent it by linear inequalities. The number of student in one class may be either greater than or less than another class.

We denote a greater symbol as ‘>’ and lesser symbol as ‘<’ when compared to other quantity.

Inequality:

Two real numbers or two algebraic expressions related by the symbol ‘<’, ‘>’, ‘≤’ or ‘≥’ this form an inequality.

Terminology related to Linear Inequalities:

Numerical inequalities: When only numerals are compared then it is numerical inequalities.
3 < 5; 7 > 5 are the examples of numerical inequalities.

Literal inequality: When literals or variables are compared with numerical or literals then it is Literal inequalities.
x < 5; y > 2; x ≥ 3, y ≤ 4 are some examples of literal inequalities.

Strict Inequalities: When two quantities are compared and one is either greater than or less than the other but not equal to other is strict inequality.
Example: ax + b < 0, ax + by > c etc.

Slack Inequalities: When two quantities are compared and one is either greater than and equal to or less than and equal to the other than it is slack inequality.
Example: ax + b ≤ 0, ax + by ≥ c

Linear inequality in one variable: Inequation containing only one variable is linear inequalities in one variable.
Example: ax + b < 0, ax + b ≤ 0, ax + b ≥ 0 etc.

Linear inequality in two variable: Inequation containing two variables is linear inequalities in two variable.
Example: ax + by < c, ax + by > c, ax + by ≥ c etc.

Rules of Linear Inequalities:

1. Equal numbers may be added to (or subtracted from) both sides of an inequality.
2. Both sides of an inequality can be multiplied (or divided) by the same positive number. But when both sides are multiplied (or divided) by a negative number, then the inequality is reversed.
3. The values of x, which make an inequality a true statement, are called solutions of the inequality.
4. To represent x < a (or x > a) on a number line, put a circle on the number a, and dark line to the left (or right) of the number a.
5. To represent x < a (or x > a) on a number line, put a circle on the number a and dark line to the left (or right) of the number a.
6. For Graphical representation of linear inequality having sign ≤ or ≥ then points on the line is also included in calculating its shading and graph of the inequality lies left (below) or right (above) of the graph.
7. For Graphical representation of linear inequality having sign < or > graph of the inequality lies only left (below) or right (above) of the graph not on the line.
8. The solution region of a system of inequalities is the region which satisfies all the given inequalities in the system simultaneously. 

Q1. 

(i) \(24x < 100\)

\(⇒\) \(x < \frac{100}{24}\) (Dividing both sides by 24) 

\(⇒\) \(x < \frac{25}{6} \)

The natural numbers less than 4 are 1, 2, 3 

∴ The solution set is {1, 2, 3}

(ii) The integers less than 4 are … -3, -2, -1, 0, 1, 2, 3, 4

∴ The solution set is {… -3, -2, -1, 0, 1, 2, 3, 4}. 

Q2. 

(i) \(-12x > 30 \)

\(⇒\) \(​​x > \frac{-30}{12} \)

\(⇒\) \(x > \frac{-5}{2} \)

There is no natural number less than, \(\frac{-5}{2} \) thus there is no solution for this inequality. 

(ii) The integers less than \(\frac{-5}{2} \) are … -5, -4, -3

The solution set is {…-5, -4, -3}. 

Q3. 

Sol:- \( 3(1 – x)< 2 (x + 4)\)

\(⇒\) \(3 - 3x < 2x + 8\)

\(⇒\) \(3 < 5x + 8\)

\(⇒\) \(-5 < 5x\)

\(⇒\) \(x > - 1\)

\(∴ x ∈ (-1, ∞)\)

Q4. 

Let the minimum marks be x. Then, 

\(⇒\) \(\frac{70 + 75 + x}{3} ≥ 60 \)

\(⇒\) \(\frac{145 + x}{3} ≥ 60 \)

\(⇒\) \(145 + x ≥ 180\)

\(⇒\) \(x ≥ 35\)

Ravi should get minimum 35 marks in the third set to have an average of at least 60 marks. 

Q5. 

Let the minimum marks scored by Sunita be x. Then, 

\(⇒\) \(\frac{87 + 92 + 94 + 95 + x}{5} ≥ 90 \)

\(⇒\) \(\frac{368 + x}{5} ≥ 90 \)

\(⇒\) \(368 + x ≥ 450 \)

\(⇒\) \(x ≥ 82\)

The minimum marks scored by Sunita must be 82. 

Correct option is A) everywhere

Correct option is C) I was talking to

Correct option is D) on foot

Commercialisation led to growth of national agriculture and agricultural problem acquired national form. 

Given:

Initial ratio of milk to water ratio = 7 : 3

Calculations:

Here, let milk in mixture be 7 liters and water be 3 liters

⇒ milk : water = 7 : 3

⇒ Let, X to be quantity of mixture withdrawn and replaced with water.

⇒ (7 - 7X/10)/(3 - 3X/10 + X) = 1/1

⇒ 7 - 7X/10 = 3 - 3X/10 + X

⇒ 7 - 3 = 7X/10 - 3X/10 + X

⇒ 4 = 14X/10

⇒ X = 20/7

⇒ Total quantity = 10 liters

⇒ Quantity withdrawn = 20/7 × 1/10

⇒ Quantity withdrawn = 2/7

∴ 2/7^th of mixture needs to be replaced with water.

Ethony propane

Situation Vacant 

REQUIRED a female Front Office Assistant with sound knowledge of computers in Hotel Dosa, Gurgaon. The candidate must be a graduate and good in communication skills with pleasing manners. Experienced applicant preferred. Salary negotiable. Interested candidates may submit their Biodata before 10th March,2013 at Hotel Dosa Reception. For further details contact us at 0xx-xxxxxxxxxx

2-bromo-propanamide

Tertiary Amine or Ethyl-diemethyl amine

The correct answer is Bikxie Pink.

• The first two-wheeler public transport service for all women started in Gurgaon was called Bikxie Pink.

• Bikxie - a bike taxi - is a service that has been playing on congested Gurgaon roads to get you to work and other engagements on time.
• Bikxie, a two-wheeler taxi service provider, has announced the ‘soft launch’ of its women-only service Bikxie Pink in Delhi, on the occasion of International Women’s Day 2018. 
• A first-of-its-kind service in the national capital, Bikxie Pink offers a fleet of electric scooters exclusively driven by women and for women.
• The service was earlier launched in Gurugram in January 2016 and claims to have received immense popularity from women commuters in the city. 
• Bikxie Pink will initially be rolled out with 10 women pilots, but the numbers shall increase to more than 100 female pilots in the next few months across Delhi NCR. 
• On the Bikxie mobile app, female customers will be able to opt for Bikxie Pink pilots, or they may hail the scooties from key metro stations.
• The app-based service is segmented into Bikxie Blue for men and Bikxie Pink for women - a safe solution where the driver is the same sex as the customer.

Difference between Methanoic acid and Ethanoic acid

38 molecules of ATP are produced per molecule of glucose in glycolysis.

Antibiotics-

Antibiotics are defined as chemical substances  (produced wholly or partially by chemical synthesis), which in low concentration, either kill or inhibit the growth of microganism by intervening in their metabolic processes.

Example- Penicillin, Streptomycin, ofloxacin, etc

Analgesics-

Drugs which reduce or abolish pain without causing impairment (reduction) of consciousnenss, mental confusion, in coordination or paralysis or some other disturbance or disorder of the nervous system are called analgesics. These are classified into the following two categories.

Non-narcotic (non-addictive) analgesics- Aspirin (2-acetaxybenzoic acid) and paracetamol (4-acetamidophenol).

Narcotic (addictive) analgesics- drugs which when administered in small doses relieve pain and produce sleep are called narcotics.

Example: Morphine, codeine, heroine

Deficiency of vitamin 'A' is responsible for night blindness.

Option : (A) Both A and R are true and R is the correct explanation of A.

H₂S is less acidic than H₂Te. acidity depends on H-S and H-Te bond dissociation energy higher the bond dissociation energy. Less will be acidity.

On moving down the group the size of the atom increases and ionization enthalpy decreases. This helps to dissociate the bond easily. That's why H₂Te is more acidic than H₂S.

Antiseptics-

Antiseptics are the chemical substances which provent the growth of micro-organism and may even kill them.

They are safe to be applied to living tissues. Thus, they are generally applied on the wounds, cuts, ulcers and diseased skin surfaces in form of antiseptic cream like furacin, soframycin. Antiseptics are also added to face powder, breath purifiers, etc to reduce the odour produced as a result of bacterial decomposition of organic matter on the body or in the mouth.

The properties of solution which depends upon number of solute particles present in the solution irrespective of their nature is called colligative properties of solution.

The following conditions are satisfied for normal colligative properties of solution.

(i) Solution should be very dilute.

(ii) Solute should be non-volatile, does not dissociable or associable.

Example:–

(a) Lowering of vapour pressure.

(b) Elevation in the boiling point.

(c) Depression in the freezing point.

(d) Osmotic pressure.

Lowering of vapour pressure – When a non-volatile solute is added in a solvent. 

The vapour pressure is lowered due to the following reason.

(i) Surface area of solution decreases from solvent molecules. V. P. ∝ surface area of solvent

(ii) Density of solution increases and rate of evaporation decreases.

Rate of Evaporation ∝ √1/density

Therefore V.P. of solution decreases from pure solvent.

V.P. of pure solvent = P_o

V.P. of solution = P_s

Lowering of V. P. = P_o – P_s 

Relative lowering of V.P.  = P_o – P_s /P_o

According to Raoult’s law

P_o – P_s/P_o = mole fraction of solute .

When Zn reacts with HNO₃ (50% concentration), then we get zinc nitrate, water and Nitric oxide.

3Zn + 8HNO₃ → 3Zn(NO₃)₂ + 2NO + 4H₂O

Electronic configuration of flourine is 1s²2s²2p_x²2p_y²2p_z². It has only one orbital half filled and no d-orbital. The orbital cannot be on paired being highly electronegative. It shows only-1 oxidation state as it saturates its valences shell by accepting one electron.

Only Xe (xenon) makes real chemical compound in the noble gases because of it converts into solid after cooling

In vapour state (~100 K). Sulphur party exists as S₂ molecule like O₂ has two unpaired electrons in the anti-bonding π mole colour orbital and exhibits paramagnetism.

Answer (b) 0.5

Noble gases are monoatomic in nature. It is because noble gases make oxidation.

In presence of moisture, chlorine acts as an oxidizing agent and a bleaching agent.

Cl₂ + H₂O → HCl + HOCl(Unstable)

HOCl → HCl + O Nascent oxygen

Coloured matter to → Colourless matter.

The bleaching action is permanent due to Nascent oxygen. Bleaching action of SO₂ in presence of moisture is due to Mascent hydrogen.

2SO₄ + 2H₂O → H₂SO₄ + 2H

Coloured matter + H → colours matter

So, bleaching action of SO₂ is temporary

The balanced equation for the above reaction is 

2 X + 5/2 O₂ → X₂O₅

Now the mass of oxygen using law of conservation of mass = 3.6769 - 2.0769

Hence mass of Oxygen utilized in the reaction = 1.6 g 

number of moles of oxygen = given mass / molar mass 

Hence the number of moles of oxygen = 1.6/ 32 = 0.05 moles 

As 5/2 moles of O2 reacts with 2 moles of X

Hence 

5/2 mole of O2 → 2 moles of X

1 mole of O2 → 4/5 moles of X

0.05 moles of O2 reacts with → 4× 0.05/ 5 moles of X

Hence the number of moles of  X present in the system = 0.04. 

Bleaching Nature of Cl₂

In presence of moisture, chlorine acts as a bleaching agent. Chlorine reacts with water to form HCl and HCLO. HCLO is not stable. It decomposed to produce nascent oxygen.

Cl₂ + H₂O → HCl + HClO

 HClO → HCl  + O

Coloured flower + Nascent oxygen → colourless flower the bleaching action of chlorine is permanent. This is due to oxidizing nature of chlorine.

Bleaching action of CO₂

In presence of moisture, SO₂ produces nascent hydrogen.

SO₂ 2H₂O → H₂SO₄ 2[H]

Coloured flower + [H] → colourless flower the bleaching is temporary. This is due to reducing nature of SO₂

n-type, Electron (s).

 Uracil  is present in RNA only.

When silicon is doped with small amount of phosphorus, its electrical conductivity increases. When silicon is doped with phosphorus, some of the positions in the lattice are substituted by phosphorus atoms. Phosphorus has five valence electrons. After forming four covalent bonds with silicon, one excess electron is left on phosphorus. This electron is not in volved in bonding and is delocolised. This contributes to electrical conductivity.

Penicillin is  Antibiotic

On warming an aqueous solution of benzene-diazonium chloride, the product obtained is Phenol

The directional growth movements of plants due to external stimuli are called tropic movement. It can be either towards the stimulus, or away from it. For example, in case of phototropic movement, shoots respond by bending towards light while roots respond by bending away from it.